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Table 4 Data of the Precision Study of NCT and TRT for the Proposed Method

From: Development and validation of derivative UV spectroscopic method for simultaneous estimation of nicotinamide and tretinoin in their binary mixtures and pharmaceutical preparations

Precision NCT RSD% TRT RSD%
Categorya 253 nm D1 245 nm D2 269 nm D2 348 nm D0
Intraday 0.73 1.02 0.92 0.76
Inter-day 24 h 1.49 0.62 0.97 1.07
Inter-day 48 h 1.89 0.98 1.19 1.51
total repetitions 1.41 0.90 1.00 1.11
  1. aFor each category: there are three concentrations and three repetitions for each concentration with a total of 27 repetitions